A model that shows the amount of energy that is passed on at each trophic level of a food chain is called ..

Which phase of the cell cycle ensures that identical copies of the dna are made for daughter cells?

Which statement describes compounds a. compounds are made of one type of atom. b. compounds cannot be represented by models. c. compounds are represented by chemical formulas. d. compounds cannot be broken down into simpler forms.

Casts and mold are a type of preservation where the original material decays, leaving a mold in surrounding rock that can be filled with another sediment a. true b. false